Question

which process occurs during the light - dependent reactions in photosynthesis?
water molecules are split.
carbon fixation occurs.
pga is reduced.
rubp is regenerated.

Explanation:

During light - dependent reactions in photosynthesis:

• Water molecules are split (photolysis of water) to release electrons, protons (\(H^{+}\)), and oxygen. This provides electrons for the electron transport chain.
• Carbon fixation (conversion of \(CO_{2}\) to an organic molecule), reduction of PGA (3 - phosphoglyceric acid), and regeneration of RuBP (ribulose - 1,5 - bisphosphate) occur in the light - independent reactions (Calvin cycle).

Answer:

Water molecules are split.